单项选择题

Computer is ______ invention.

A．so an important
B．such an important
C．such important
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单项选择题
You haven't heard from John for a long time, ______ you
A．are
B．do
C．have
单项选择题
Early in ______ half of the game Peter kicked a goal.
A．one
B．first
C．the first
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